Cooling drum for cooling of liquid and molten substances



SCP- 26, 1933- A. GERSTENBERG 1,928,173

COOLING DRUM FOR COOLING OF LIQUID AND MOLTEN SUBSTANCES Filed May 23, 1932 venan Patented seppze, 1933v v fcooLING DRUM Fon cooLING F LIQUID n l AND MoLrENsUs'rANcEs i iAage Gerstenberg, Fred-eriksberg, Denmark Application May 23, 1932, sriaiNa 613,128, ma

in Germany May 2319731Hr c claims. (circs-fies) In the cooling or crystallisation of liquid and p molten substances', foiI instancefatty substances and fatty emulsions, on rotary`4 cooling, drumait has formerly beenV proposed tolet the cooling -5 drum operate ,asan evaporator in a 'cooling plant,

in which acondensed gas, such as liquid` ainmonia,' carbon dioxide, 'sulphuric oxide or the like, is usedsand isdirected centrally into the drum, wherelit produces the Vdesired cooling effect by evaporation, the vapours being then exhausted from the drum, comiensedV andre-used. Withthe heretofore known cooling drums 'of thiskind, liquid impurities such as lubricating oil and sometimes also solidimpurities such as A `l5 mill scales deposited on the inside of the pipes vof which thesystem of the plant is formed, .will

gradually be carried with the lcooling medium into the drum Yand deposited on 'the inside wall thereof` This deposition onV the druin walls r 90 forms a heat insulating layer, which decreases tliel, cooling efficiency; Especially does any oil. deposition on the inside of tht-drumwalll haveja .con-

siderable heat insulating effect, Acausingv-irregular cooling results. Y f

prevent impurities from being depositedon-the inside of the cooling drum. Now "oil," which penetratesthrough leakages in vstuing boxes etc. around the supply pipe from the coolingv drum Nant. Some'of the `oil mayY enter Ythe isupply channel for cooling medium Vfrom the stuffing boxes, through which the supply and discharge pipe for the cooling medium extends intothe "$5 drum. These stuffing boxes of coursephave to be lubricated with oil, and incrder that nthelatter `may be forced into the stuffing 1boxes, the lubrii cation has to be effected ata pressure exceeding -the pressure of thev cooling medium. It, will 40 therefore be impossibleto prevent the oilfroinV penetrating into the medium, as in order `to 'secure sufficient. tightness, more oil has generally to be supplied than is used' for the lubrication.

, Oil penetrxattingintoY the said supply` piperfroznV the stufng box, by means of which the supply' pipe for thev cooling mediux'nvis connectedA tightly tothe shaft, will therefore'be carried along with cooling medium intorthe cooling drum i Accordingv to the present inventionythis draw-f 50 back is avoided by reason Vof the fact that the coollatter, is or are situated between the oil "l where the cooling medium isintroduced into the shafn- Thus the oil is prevented froml 'r'ener-H ing from the oil chamber into the cooling di in latten i i Y Y l Y* i i .y Lubricating oil may, however, Valso penetrate cylindrical coolingdrum, b :the shaft of the same and c vthe bearings supporting the shaft b; The V-,shaft is rotated by a driving motor or driving shaft not shown.

kother suitable substance which in known manner which-'the discharged cooling ,mediuinlef 1' s *he thereof and theV part of the stuffing-boxe together with the cooling medium'llo'wingft to, because the oil, before being able to pensais-tc -forward to theincoming medium, will 'inset the escaping medium and be carried along .with the forward tothe cooling medium in otherlportions of the vplant thaninthe s tuing boxes about thev 'Y shaft of the rotary drunn as for instance into the compressor, if suchis not carefully controlled and foiled, and oil which in this manner is mixe-d with the coolingv medium would be carried to the .cooling drum. f i

In orderto avoid such oil and solid impurities such as mill scales from the coolingpipes being deposited on the inside .ofthe cooling drum, there is according to Vthe invention inserted a V,sieve vin Y :Y V-theclrum,vthro`ugh which sieve the cooling medium 25 The present invention hasifor its purpose to g has tojflow in order Vto :reachthe sai-d wall or walls. For*cylindrical ycooling drums this sieve is suitablyconstructe'd as a cylinder surface fitting ,tightly to both ends of .the-drum. Betweenthe cylindrical wall, on which the substance is cooled 5 0 may originate from several parts of thecooling Y, V l v Y into` which the liquid cooling medium penetrates downf, and this sieve,l an annular spaceis formed,

through the sieve, and from which it Ais exhausted in any suitable mannerv after' having been evaporated. vlt'ost'of'the oil, which should enter the cooling drurnfwould togetherA with solid, impurities be retained/by the sieve and adhere to the -isarne without preventing l the cooling medium -from entering the annular space between the sieve and the outerwall ofthe drum.

In the drawing, which shows one vconstruction of theinvention:

Aand y Fig. ,2 a cross-section of thedrum. Y VIn this illustrativeconstruction, a is a mainly evaporates in the cooling drum a and 'thereby provides the desired cooling effect, is directed through` a nipple i into a chamber t at the end of a' a stuing box q. From the chamber t, the cooling medium flows to the cooling drum Va by way of a pipe h disposed in a central bore Z in the shaft end m, and a channel d disposed -in the shaft b-V as an extension of the pipe h.

The outside diameter of the pipe his smaller.

than thediameter of the bore l. VBy way of the annular space between the pipe h and the shaft end m,the evaporated cooling medium leaves the cooling drum and flows through radial bores p in the part of the shaft end m situated in the stuffing-box casing and thence to a discharge nipple 7. The latter enters between two annular flanges n and o, which t tightly about/the shaft end m. The bores p open into the space between the said flanges.

The cavity r formed between the stuffing box q, the shaft end m and the stuflingbox casing g forms anoil chamber, to which the oil is supplied by way of a lubricating hole .'r. As appearsfrom Fig. 1, the discharge openingsp are situated between the oil chamber r and the supply chamber t for the cooling medium. Y'

Any oil happening to penetrate between the flanges fn and o willbe carried awayfby theA escaping cooling medium,l and'does not penetrate forward to the arriving cooling medium. Between the fiange n and the supply nipple i, packin'gdeL vices of known kind, but not shown, are provided, which prevent any leakage, in the packing-box casing, of the arriving cooling medium tothe outgoing cooling medium owing tothe difference between the pressures of the arriving the leaving cooling medium. 1

The drum ais filled with liquid cooling* medium to a suitable level, and thel said cooling medium penetrates through a cylindrical sieve sy inserted in the drum, to the inside of the cylindrical wall of the drum, whereby the latter will be cooled together with the substance spread on'theoutside lfthereof, which substance in ordinary knownmanf sieve s retains any solid impurities that by'fthe neris deposited'on to the'cooling surface and, after the cooling, is scraped away therefrom. The

cooling medium are carried into'the-druml'from the not shownpipe system of the coolingfplant. The annular space between the-sieve sand the cylindrical wall of the drum may have any suit- -able radial width.v The sieve, however, should not e be in contact with the inside of the cylindrical wall of the drum. Y e Y e I Although the invention has been above described' in connection with cylindrical cooling drums with horizontalshafhlit may also be-used in Having nowfparticularly.described and ascer-l tained the nature of my invention and in what manner the same isv to be performed I declare that what I claim ist'- v n 1L A rotary cooling drum for cooling liquid and fatty substances, comprising a cylindrical shell, a shaft extendingl through said shell coaxially therewith, means supporting the shell on the shaft and4 together therewith forming a closed hollow drum, a channel extending through one end of theshaft for introducing to the drum a liquid cooling medium `adapted to be evaporated vtherein, a second channel annularly surrounding the' first named channel and serving for the discharge Aof the evaporated cooling'medium from the drum, a single stuffing box surrounding said end of the shaft andrhaving means for sealing the introducing channel and also the discharge channel from the outerair, and means for connecting said channelsl respectively with supply and discharge pipes.

2. AV rotary cooling drum-for cooling liquid and fatty substances comprising acylindrical shell, a shaft extending through said shell coaxially therewith, means for supporting the shell 'onthe shaft and together therewith forming a .introductory channel and a lubricating chamber 1in Atherother end of said box, means connecting ythe inletlchamber with a supply pipe, and means connecting the discharge channeiof the shaft with a discharge pipe at a peint Withinthe stuffing box between said inlet and lubricating chambers by `which arrangement the lubricant in the Y, lubricating chamber is prevented from penetrating intol the passages through Vwhich the liquid'cooling medium is fed through the stuf- V ngbox andshaft end into the. drum.

' 3. A double-Walled rotary cooling drum according to claim 1 characterized by the fact that the inner wall ofthe drum is perforated.

. 4. In combination with a rotary cooling drum for l cooling or crystallizing liquid and molten .substances such as'fatty substances .and fatty emulsions which are spread onto the surfaceV of fthe drum and cooled by evaporation of a liquid cooling medium in the interior of the drum, means for preventing the deposition of impurities on therinside wallor walls of the drum comprising a cylindric sieve disposed therein through which the cooling medium must ilow to reach said wall or Walls.

-5.,A rotary cooling druniaccording 'toy claim 4,'wherein the sieve is so disposed as to form an annular space between it and the drum wall, into which space the cooling' medium is directed through the sieve, the latterbeing fitted tightly to the ends of the drum. l

V6. A cooling apparatus according to claim 1, characterizedby the fact that the channel by ,way ofV which the cooling medium is introduced to the drum, and the channel by way ofwhich the vrnediumeis discharged from thesame, are both disposed in the same end of the'drum shaftand are closed against the outer air by means of the commonstuffing box surrounding the `shaft end.

' `AAGE GERSTENBERG. 

